SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dd073c0da5534da2fff982f8548a5ab4a01fc3d91ad937ff2e967f7116b3b23' 
  AND token = 'rG2yIM2GVj3cJIRgTlHT3tfW+WHAqFmUkPMEzavFn/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}